FIX:display msg when cannot edit filament

jira:[edit filament]

Change-Id: I7e2b4fabeb3930f34fc252f1334e168e4f623b77
(cherry picked from commit 95655e067a7187afd29e53759aae8e3023a5a7f7)

src/slic3r/GUI/AMSMaterialsSetting.cpp

@@ -413,6 +413,8 @@ void AMSMaterialsSetting::update()
 
 void AMSMaterialsSetting::enable_confirm_button(bool en)
 {
+    m_tip_readonly->SetLabelText(wxEmptyString);
+
     if (!en) {
         m_button_confirm->Show(obj->is_support_filament_setting_inprinting);
     }